Bag-sewing machine



I. F. WEBB.

BAG SEWING MACHINE.

APPLICATION FILED APR. 29, 1919.

Patented J une 7, 1921.

2 $HEETS$HEET I 9 INVENTOR ATORNEY W ah WITNESSES:

I. F. WEBB.

BAG SEWING MACHINE.

APPLICATION mu) APR-29,1919.

1,380,758. Patented June 7,1921.

I 2 $HEETSSHEET Z.

WITNESSES:

PAEEWE QFHQEG IRVING F. WEBB, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANU- FAGTURING COMPANY, A CORPORATION OF NEW JERSEY.

BAG-SEWING- MACHINE.

Specification of Letters Patent.

Patented June 7, 1921.

Application filed April 29, 1919. Serial No. 293,537.

citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Bag-Sewing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to sewing machines and particularly to machines for sewing bags after they have been filled preparatory to shipment.

It aims to provide a new and improved arrangement of the component mechanisms and their supporting frame which will permit of dropping the bags through the frame and then advancing the bags in a path at a substantial angle to their line of fall so that the bags will be finished free and clear of the frame of the machine and consequently may be handled with freedom. It also contemplates closing the top and bottom respectively of two bags in one operation and preferably contemplates severing one bag from the bottom of another at the same time as the adjacent top and bottom of two bags are being stitched.

The invention comprises essentially a frame having lateral arms connected together at one of their ends and free at their opposite ends where stitch forming and feeding mechanisms are cooperatively arranged in working relation to seam the material forming the bag transversely while it is being moved in a substantially vertical plane in a line at right angles to the direction of its previous passage downward through the frame of the machine. The frame is approximately C-shape in plan view and its arms are spaced apart in a substantially horizontal plane to permit lowering the end of a long tube of fabric or other material downward therebetween; Cutting mechanism is preferably provided in rear of the needles and may comprise a blade carried by the needle-bar and cooperating with a suitable ledger element formed in or secured to the throat-plate of the machine.

The invention is illustrated in the accompanying drawings in which Figure 1 repre sents a plan view of a machine embodying the principles of the invention Fig. 2 represents an inverted rear elevation and Fig. 3 represents a side elevation of the same.

In its preferred form the invention com prises a supporting member 1 which connects a pair of spaced arms 2 and 3 extendlng laterally from the supporting member and terminating in bent ends and 5 constitutmg a head and work-support or post, respectively. The supporting member 1 is flanged as indicated at 6 and receives bolts 7 which are adapted to anchor the frame in a horizontal position to any suitable column or support with its arms in a substantially horizontal plane. It will be apparent from a glance at Fig. 1 of the drawings that the frame is substantially C-shaped in plan view and that the support 1, the arms 2 and 3 and the head and post 4 and 5 together define an approximately rectangular opening which may be of any size desired preferably being sufficiently large to accommodate the largest bag or sack that may be required.

ny suitable stitch-forming mechanism may be embodied in the machine but it is preferred to employ a two-thread chainstitch machine having a pair of spaced needles 8 carried by a needle-bar 9 which is operated through a link 10 by a lever 11 fulcrumed intermediate its ends as indicated at 13 and operated through a ball-and-socket connection 14 by a pitman 15 which is universally connected as indicated at 16 to a crank 17 on the main-shaft 18'of the machine. In the bent end or head 4 of the machine as usual is a presser-foot 19, which is connected at its upper end to a bellcranklever 20 linked, as indicated at 21, to a pin 22 in the end of a rod 23 which is yieldingly urged in a direction to hold the presser-foot down upon the work by a coiled spring 24. The pin 22 is preferably provided with a roller 25 engageable by the cam-lever 26 for permitting elevation of the pressenfoot.

The other arm 8 of the machine has bear: ings 27 and 28 carrying the main-shaft 18 of the machine which has an eccentric 29 embraced by a grooved block 30 sustained on a verticallyarranged slide-pin 31 and adapted to be reciprocated up and down and thereby to shift a fulcrum-pin 32 for a lever 33 which carries a feed-dog 34 at its upper free end. Thus movements are imparted to the E05 with the work. lVork-advancing movements are imparted to the feed-dog from an eccentric 35 on the main-shaft through a pitman 36 universally connected at its upper end to a bellcrank 37, Figs. 1 and 3, which is fulcrumed at 38 and has a grooved arm 39, Fig. 3, receiving a roller 40. The roller 40 passes through a slot 41 in the feed-dog supporting lever 33 and is adapted to impart the feeding movements to the feed-dog. For varying the stitch length the roller 40 is adjusted toward or from the fulcrum 38 of the grooved arm 39 and this may be done through a lever 42 carrying the roller by altering the position of its fulcrum-pin 43 in a slot 44 provided in the bent arm or post 5.

Cotiperating with each needle is a threadcarrying looper 45 which is sustained by a bellcrank 46 fulcrumed on a pin 47 and operated through a universal connection 48 by a pitman 49 whose strapped end embraces an eccentric 50' on the main-shaft 18. Intel-mediate the eccentric 50 and universal connection 48 the pitman 49 is connected by a ball-and-socket joint 51 to the free end of a lever 52 which is fixedly fulcrumed at The lever 52 is confined against lateral movement in the direction of the axis of its fulcrum and consequently its universal connection 51 serves as a fulcrum for the pitman 49 nd compels its upper end to shift slightly in a direction transverse the line of feed thereby compelling the, bellcrank-lever 46 carrying the two levers to slide on its fulcrum-pin 47 while oscillating. In this way needle-avoiding movements are imparted to the looper as well as endwise movements from the single eccentric 50 on the main shaft. The bellcrank-lever 46 has a third arm indicated by the numeral 54 which is apertured to receive thread and functions as a take-up for the thread running to the looper. A pull-off indicated generally by the numeral 55 is preferably provided for drawing the requisite quantity of looper thread from the supply. For controlling the needle-thread any suitable form of takeup may be provided such as indicated by the numeral 5 Cutting mechanism is preferably located to operate upon the material between the parallel rows of stitching slightly in rear of the stitching point and for this purpose a cutting blade indicated at 57 is clamped to the lower end of the needle-bar 9 and preferably it is arranged to cotiperate with a slot in the throat-plate 58 in the manner that is well understood. For facility in getting at the mechanism within the end of the bent arm or post 5 a portion 59 of its surface is cut away in the form of a plate hinged at 60 to the frame. and?) may be braced if desired by rods 61 in order to render the frame more rigid.

The arms 2 the arms by the impact of filling substance poured into an accessible mouth of the tubular material at a point a considerable distance relatively above the machine. The charge by the action of gravity, if sufficiently heavy, may carry the tubular material downward through the frame until the lower end, which has been previously closed, rests upon a flat form of bracket which is so arranged as to halt the fall of the bag with its mouth in line with the line of feed. The operator may then slide the bag horizontally on its bracket and introduce its mouth between the presser-footand throat-. plate. The feeding mechanism then advances the bag mouth a stitch length at a time and at least two parallel rows, of spaced stitches are made above the contents of the bag and at the same time the material is severed between the rows of stitches so that the top of one bag and the bottom of another may be closed in one operation. In moving the bag horizontally manually to the needle and thereafter mechanically by the action of the feed-dog the operator is not compelled to exert himself to any extent as the upper end of the tubular material may be supported in such a way as to allow the bag to swing like a pendulum about its upper end.

It will thus be seen that the machine of the present invention does not obstruct manipulation of the bag in any way While it is being filled and closed in the system in which it is contemplated to employ the pres ent machine and it is to be noted particularly that when the bag is finished, i. 6., when its mouth has been stitched together and severed from the upper portion of the tubular material, it occupies a position free and clear of the frame of the machine from whence its removal is unobstructed.

Having thus set forth the nature of the invention, what I claim herein is 1. A sewing machine having a frame consisting of horizontally spaced arms connected together at one side of the machine and extending inwardly toward each other and spaced apart at their opposite free ends for permitting the bodily passage therethrough of a filled bag, stitchforming mechanism sustained by one of the arms, work-advancin mechanism sustained by the other arm and arranged to feed the bag mouth in the direction of extent of the arms and out of the space between the arms.

2. A sewing machine having stitch-forming mechanism including a horizontally reciprocating needle and work-advancing mechanism including a feed-dog, said feeddog having four motions in a plane substantially parallel to the needle-bar, a frame operatively supporting said stitch-forming and work-advancing mechanisms including horizontally spaced arms extending in the general direction of the plane of feed-dog movement and a support for said arms to one side of the path in which the bag mouth is advanced by the feed-dog, said arms and support defining a bag passage open upwardly whereby mouths of bags dropped through the space between the arms and support may be stitched and removed from the machine by movement thereof in the direction of feed without hindrance.

3. A sewing machine having a frame'comprising a pair of laterally spaced arms lo-'.

cated in substantially the same horizontal plane having a common supporting connection and terminating in bent free ends which face each other, stltch-forming mechanism including a needle and workadvancing mechanism including a feed-dog, said needle and feed-dog being located respectively at the bent free ends of the arms, and said feeddog being operated in substantially a horizontal plane to feed work out of the space between the arms away from the frame of the machine.

fl. A sewing machine having a frame com- &

prising horizontally spaced arms which defines in plan view a body passage for ba s moving perpendicularly downward, stitc forming mechanism including at least two.

vertically spaced needles and cooperating work-advancing mechanism arranged to feed the work in a direction away from said passage, and trimming mechanism including a cutting blade effective between the lines of stitches adjacentthe stitching point for severing material andfor permitting the top and bottom, respectively, of two bags to be finished in one operation.

5. A sewing machine having a frame which is approximately G-shape in plan View and permits dropping therethrough V substances contained in the lower end of a tubular formed material of greater length than a single finished bag, stitch-forming mechanism including at least two vertically spaced needles, work-advancing mechanism arranged to feed the tubular material at a substantial angle to its length and out of the frame, and trimming mechanism -including a cutter carried by the needle-bar with its cutting edge effective between the lines of stitches made by the two spaced needles.

In testimony whereof, I have signed my name to this specification" IRVING F. WEBB. 

